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What does 'Normally Closed' mean for this solenoid valve
it ensures seamless compatibility for system upgrades
This unit is the direct technical replacement for discontinued or legacy models including the 120U1736
Corrosion Resistance: Manufactured with materials specifically chosen to withstand the acidic condensate produced during the combustion process
releasing excess pressure to protect the boiler and connected components from damage or failure
Tekmar Controls 004 Relay 321894-709 What does 'Normally Closed' meanThe Tekmar 004 Relay is a heavy duty DPDT (Double Pole Double Throw) general purpose relay designed for reliable switching in commercial and residential HVAC hydronic systems. Operating on a 120Vac coil voltage, this electrical component is essential for isolating circuits or controlling multiple loads such as pumps, fans, and valves. The Tekmar 004 features a plug in wiring base with screw terminals, significantly reducing field installation time and